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D9112 Operation & Installation Manual
Page 21
© 1993 Radionics
74-06144-000-C 2/96
Battery Supervision (Continued)
When battery voltage returns to 13.7 VDC the Low Battery LED goes out. If the panel is
programmed for power supervision, it transmits a BATTERY RESTORAL report in the
Modem II transmission format or RESTORAL ZN 9 report in the BFSK format. At 13.9
VDC the Charging Status LED goes out.
Investigate low battery reports right away
: If primary (AC) power is off and the
discharge continues, the panel becomes inoperative when the battery voltage drops
below 10.2 VDC.
Battery Charging Circuit
Float Charge
The float voltage for the battery charging circuit is 13.9 VDC at a maximum current of 1.4
Amps. Deduct any continuous load for devices connected to the panel from 1.4 Amps to
find the actual current available for charging.
Load Shed Relay protects battery:
During an AC power loss the battery supplies all
power to the security system. If the battery voltage falls below 10.2 volts during an AC
power loss, a “load shed” relay isolates the battery from the panel and disables the panel.
Load shed protects the battery from being damaged by deep discharge. When AC power
restores, the load shed relay resets and battery voltage is again available.
Reset or power down required for shorted battery:
If the D9112 determines the
battery is shorted, it uses the load shed relay to disconnect the battery. You must reset or
power down the panel after correcting the problem to reset the load shed relay and
reconnect the battery.
Reset the panel by momentarily placing the reset pin in the disable position. See Figure
3. The red Low Battery LED continues to flash until you reset the panel.
A shorted battery condition is created either by a shorted cell inside the battery or by a
short on terminals 4 and 5. A shorted battery may generate WATCHDOG RESET
reports.
Battery Discharge/Recharge Schedule (No AC Power)
Discharge Cycle
AC OFF AC fail report when AC fails if panel is programmed to report AC failure at
occurrence.
13.9 VDC Charging float level
13.8 VDC Charging Status LED on
12.1 VDC Low Battery & AC fail reports if programmed; Low Battery LED on
10.2 VDC Battery load shed (processing functions continue if AC is present)
Recharge Cycle
AC ON Load shed relay resets, battery charging begins, battery trouble and
AC restoral reports sent.
13.7 VDC Battery restoral reports sent, Low Battery LED off
13.9 VDC Charging Status LED off, battery float charged